Bigge Island is the second largest island of the Bonaparte Archipelago (after Augustus Island) and has a total area of 178 square kilometres.The island has many shallow reef-strewn bays around its heavily indented coastline on all four sides. Boomerang Bay is the largest bay and is found on the western coast of the island.
Indigenous Australian rock art exists on the cliffs and cave walls around Wary Bay. The paintings include examples of first contact art and Wandjina figures. The rock art was created by the Wunambal people.
The lack of feral predators makes the island an ideal habitat for vulnerable mammal species such as the Monjon, the Ilangnalya and the Northern quoll.